WebSVN – SvarDOS – Diff – /svarcom/trunk/cmd.c


/* This file is part of the SvarCOM project and is published under the terms
 * of the MIT license.
 *
 * Copyright (C) 2021-2022 Mateusz Viste
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
/* entry point for internal commands, it matches internal commands and
 * executes them.
 *
 * returns one of the following values:
 *   CMD_OK               command executed successfully
 *   CMD_FAIL             command ended in error
 *   CMD_CHANGED          command-line has been modified (used by IF)
 *   CMD_CHANGED_BY_CALL  command-line has been modified by CALL
 *   CMD_NOTFOUND         command unrecognized
 */
 
#include <i86.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "env.h"
#include "helpers.h"
#include "redir.h"
#include "rmodinit.h"
#include "sayonara.h"
 
#include "cmd.h"
 
 
struct cmd_funcparam {
  int argc;                 /* number of arguments */
  const char *argv[128];    /* pointers to each argument */
  char argvbuf[256];        /* buffer that hold data pointed out by argv[] */
  unsigned short env_seg;   /* segment of environment block */
  struct rmod_props far *rmod; /* rmod settings */
  unsigned short argoffset; /* offset of cmdline where first argument starts */
  const char *cmdline;      /* original cmdline (terminated by a NULL) */
  unsigned short BUFFERSZ;  /* avail space in BUFFER */
  char BUFFER[1];           /* a buffer for whatever is needed (must be last) */
};
 
/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */
static int cmd_ishlp(const struct cmd_funcparam *p) {
  int i;
  for (i = 0; i < p->argc; i++) {
    if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);
  }
  return(0);
}
 
#include "cmd/_notimpl.c"
#include "cmd/break.c"
#include "cmd/call.c"
#include "cmd/cd.c"
#include "cmd/chcp.c"
#include "cmd/cls.c"
#include "cmd/copy.c"
#include "cmd/date.c"
#include "cmd/del.c"
#include "cmd/for.c"
#include "cmd/goto.c"
#include "cmd/if.c"
#include "cmd/vol.c"     /* must be included before dir.c due to dependency */
#include "cmd/dir.c"
#include "cmd/echo.c"
#include "cmd/exit.c"
#include "cmd/ln.c"
#include "cmd/mkdir.c"
#include "cmd/path.c"
#include "cmd/pause.c"
#include "cmd/prompt.c"
#include "cmd/rem.c"
#include "cmd/rename.c"
#include "cmd/rmdir.c"
#include "cmd/set.c"
#include "cmd/shift.c"
#include "cmd/time.c"
#include "cmd/type.c"
#include "cmd/ver.c"
#include "cmd/verify.c"
 
 
struct CMD_ID {
  const char *cmd;
  enum cmd_result (*func_ptr)(struct cmd_funcparam *); /* pointer to handling function */
};
 
const struct CMD_ID INTERNAL_CMDS[] = {
  {"BREAK",   cmd_break},
  {"CALL",    cmd_call},
  {"CD",      cmd_cd},
  {"CHCP",    cmd_chcp},
  {"CHDIR",   cmd_cd},
  {"CLS",     cmd_cls},
  {"COPY",    cmd_copy},
  {"CTTY",    cmd_notimpl},
  {"DATE",    cmd_date},
  {"DEL",     cmd_del},
  {"DIR",     cmd_dir},
  {"ECHO",    cmd_echo},
  {"ERASE",   cmd_del},
  {"EXIT",    cmd_exit},
  {"FOR",     cmd_for},
  {"GOTO",    cmd_goto},
  {"IF",      cmd_if},
  {"LH",      cmd_notimpl},
  {"LN",      cmd_ln},
  {"LOADHIGH",cmd_notimpl},
  {"MD",      cmd_mkdir},
  {"MKDIR",   cmd_mkdir},
  {"PAUSE",   cmd_pause},
  {"PATH",    cmd_path},
  {"PROMPT",  cmd_prompt},
  {"RD",      cmd_rmdir},
  {"REM",     cmd_rem},
  {"REN",     cmd_rename},
  {"RENAME",  cmd_rename},
  {"RMDIR",   cmd_rmdir},
  {"SET",     cmd_set},
  {"SHIFT",   cmd_shift},
  {"TIME",    cmd_time},
  {"TYPE",    cmd_type},
  {"VER",     cmd_ver},
  {"VERIFY",  cmd_verify},
  {"VOL",     cmd_vol},
  {NULL,      NULL}
};
 
 
/* NULL if cmdline is not matching an internal command, otherwise returns a
 * pointer to a CMD_ID struct */
static const struct CMD_ID *cmd_match(const char *cmdline, unsigned short *argoffset) {
  unsigned short i;
  char buff[10];
 
  /* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */
  for (i = 0; i < 9; i++) {
    if (cmdline[i] == ' ') break;
    if (cmdline[i] == 0) break;
    if (cmdline[i] == '\t') break;
    if (cmdline[i] == '\r') break;
    if (cmdline[i] == '.') break;
    if (cmdline[i] == '/') break;
    if (cmdline[i] == '\\') break;
    buff[i] = cmdline[i];
  }
  buff[i] = 0;
 
  /* advance to nearest non-space to find where arguments start */
  while (cmdline[i] == ' ') i++;
  *argoffset = i;
 
  /* try matching an internal command */
  for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {
    /*printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); */
    if (imatch(buff, INTERNAL_CMDS[i].cmd)) {
      /*printf("match cmd i=%u (buff=%s)\r\n", i, buff);*/
      return(&(INTERNAL_CMDS[i]));
    }
  }
 
  return(NULL); /* command is not recognized as internal */
}
 
 
/* explodes a command into an array of arguments where last arg is NULL.
 * if argvlist is not NULL, it will be filled with pointers that point to buff
 * locations. buff is filled with all the arguments, each argument being
 * zero-separated. buff is terminated with an empty argument to mark the end
 * of arguments.
 * returns number of args */
unsigned short cmd_explode(char *buff, const char far *s, char const **argvlist) {
  int si = 0, argc = 0, i = 0;
  for (;;) {
    /* skip to next non-space character */
    while (s[si] == ' ') si++;
    /* end of string? */
    if (s[si] == 0) break;
    /* set argv ptr */
    if (argvlist) argvlist[argc] = buff + i;
    argc++;
    /* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */
    do {
      buff[i++] = s[si++];
    } while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');
    buff[i++] = 0;
    /* is this end of string? */
    if (s[si] == 0) break;
  }
  buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */
  if (argvlist) argvlist[argc] = NULL;
  return(argc);
}
 
 
enum cmd_result cmd_process(struct rmod_props far *rmod, unsigned short env_seg, const char *cmdline, void *BUFFER, unsigned short BUFFERSZ, const struct redir_data *redir, unsigned char delstdin) {
  const struct CMD_ID *cmdptr;
  unsigned short argoffset;
  enum cmd_result cmdres;
  struct cmd_funcparam *p = (void *)BUFFER;
  p->BUFFERSZ = BUFFERSZ - sizeof(*p);
 
  /* special case: is this a drive change? (like "E:") */
  if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') || (cmdline[2] == 0))) {
    if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) || ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {
      unsigned char drive = cmdline[0];
      unsigned char curdrive = 0;
      if (drive >= 'a') {
        drive -= 'a';
      } else {
        drive -= 'A';
      }
      _asm {
        push ax
        push dx
        mov ah, 0x0e     /* DOS 1+ - SELECT DEFAULT DRIVE */
        mov dl, drive    /* DL = new default drive (00h = A:, 01h = B:, etc) */
        int 0x21
        mov ah, 0x19     /* DOS 1+ - GET CURRENT DRIVE */
        int 0x21
        mov curdrive, al /* cur drive (0=A, 1=B, etc) */
        pop dx
        pop ax
      }
      if (curdrive == drive) return(CMD_OK);
      nls_outputnl_doserr(0x0f);
      return(CMD_FAIL);
    }
  }
 
  /* try matching an internal command */
  cmdptr = cmd_match(cmdline, &argoffset);
  if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */
 
  /* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */
 
  /* apply redirections (if any) */
  if (redir_apply(redir) != 0) return(CMD_FAIL);
 
  /* prepare function parameters and feed it to the cmd handling function */
  p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);
  p->env_seg = env_seg;
  p->rmod = rmod;
  p->argoffset = argoffset;
  p->cmdline = cmdline;
 
  cmdres = (cmdptr->func_ptr)(p);
 
  /* cancel redirections */
  redir_revert();
 
  /* delete stdin temporary file */
  if (delstdin) {
    const char *fname = redir->stdinfile;
    unsigned short doserr = 0;
    _asm {
      push ax
      push dx
      mov ah, 0x41  /* delete a file */
      mov dx, fname /* DS:DX - filename to delete */
      int 0x21
      jnc DONE
      mov doserr, ax
      DONE:
      pop dx
      pop ax
    }
    if (doserr) {
      output(fname);
      output(": ");
      nls_outputnl_doserr(doserr);
    }
  }
 
  return(cmdres);
}
 

Rev 962	Rev 982
1	`/* This file is part of the SvarCOM project and is published under the terms`	1	`/* This file is part of the SvarCOM project and is published under the terms`
2	`* of the MIT license.`	2	`* of the MIT license.`
3	`*`	3	`*`
4	`* Copyright (C) 2021-2022 Mateusz Viste`	4	`* Copyright (C) 2021-2022 Mateusz Viste`
5	`*`	5	`*`
6	`* Permission is hereby granted, free of charge, to any person obtaining a`	6	`* Permission is hereby granted, free of charge, to any person obtaining a`
7	`* copy of this software and associated documentation files (the "Software"),`	7	`* copy of this software and associated documentation files (the "Software"),`
8	`* to deal in the Software without restriction, including without limitation`	8	`* to deal in the Software without restriction, including without limitation`
9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`	9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`
10	`* and/or sell copies of the Software, and to permit persons to whom the`	10	`* and/or sell copies of the Software, and to permit persons to whom the`
11	`* Software is furnished to do so, subject to the following conditions:`	11	`* Software is furnished to do so, subject to the following conditions:`
12	`*`	12	`*`
13	`* The above copyright notice and this permission notice shall be included in`	13	`* The above copyright notice and this permission notice shall be included in`
14	`* all copies or substantial portions of the Software.`	14	`* all copies or substantial portions of the Software.`
15	`*`	15	`*`
16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`	21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`
22	`* DEALINGS IN THE SOFTWARE.`	22	`* DEALINGS IN THE SOFTWARE.`
23	`*/`	23	`*/`
24		24
25	`/* entry point for internal commands, it matches internal commands and`	25	`/* entry point for internal commands, it matches internal commands and`
26	`* executes them.`	26	`* executes them.`
27	`*`	27	`*`
28	`* returns one of the following values:`	28	`* returns one of the following values:`
29	`* CMD_OK command executed successfully`	29	`* CMD_OK command executed successfully`
30	`* CMD_FAIL command ended in error`	30	`* CMD_FAIL command ended in error`
31	`* CMD_CHANGED command-line has been modified (used by IF)`	31	`* CMD_CHANGED command-line has been modified (used by IF)`
32	`* CMD_CHANGED_BY_CALL command-line has been modified by CALL`	32	`* CMD_CHANGED_BY_CALL command-line has been modified by CALL`
33	`* CMD_NOTFOUND command unrecognized`	33	`* CMD_NOTFOUND command unrecognized`
34	`*/`	34	`*/`
35		35
36	`#include <i86.h>`	36	`#include <i86.h>`
37	`#include <stdio.h>`	37	`#include <stdio.h>`
38	`#include <stdlib.h>`	38	`#include <stdlib.h>`
39	`#include <string.h>`	39	`#include <string.h>`
40		40
41	`#include "env.h"`	41	`#include "env.h"`
42	`#include "helpers.h"`	42	`#include "helpers.h"`
43	`#include "redir.h"`	43	`#include "redir.h"`
44	`#include "rmodinit.h"`	44	`#include "rmodinit.h"`
45	`#include "sayonara.h"`	45	`#include "sayonara.h"`
46		46
47	`#include "cmd.h"`	47	`#include "cmd.h"`
48		48
49		49
50	`struct cmd_funcparam {`	50	`struct cmd_funcparam {`
51	`int argc; /* number of arguments */`	51	`int argc; /* number of arguments */`
52	`const char argv[128]; / pointers to each argument */`	52	`const char argv[128]; / pointers to each argument */`
53	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`	53	`char argvbuf[256]; /* buffer that hold data pointed out by argv[] */`
54	`unsigned short env_seg; /* segment of environment block */`	54	`unsigned short env_seg; /* segment of environment block */`
55	`struct rmod_props far rmod; / rmod settings */`	55	`struct rmod_props far rmod; / rmod settings */`
56	`unsigned short argoffset; /* offset of cmdline where first argument starts */`	56	`unsigned short argoffset; /* offset of cmdline where first argument starts */`
57	`const char cmdline; / original cmdline (terminated by a NULL) */`	57	`const char cmdline; / original cmdline (terminated by a NULL) */`
58	`unsigned short BUFFERSZ; /* avail space in BUFFER */`	58	`unsigned short BUFFERSZ; /* avail space in BUFFER */`
59	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`	59	`char BUFFER[1]; /* a buffer for whatever is needed (must be last) */`
60	`};`	60	`};`
61		61
62	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`	62	`/* scans argv for the presence of a "/?" parameter. returns 1 if found, 0 otherwise */`
63	`static int cmd_ishlp(const struct cmd_funcparam *p) {`	63	`static int cmd_ishlp(const struct cmd_funcparam *p) {`
64	`int i;`	64	`int i;`
65	`for (i = 0; i < p->argc; i++) {`	65	`for (i = 0; i < p->argc; i++) {`
66	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`	66	`if ((p->argv[i][0] == '/') && (p->argv[i][1] == '?')) return(1);`
67	`}`	67	`}`
68	`return(0);`	68	`return(0);`
69	`}`	69	`}`
70		70
71	`#include "cmd/_notimpl.c"`	71	`#include "cmd/_notimpl.c"`
72	`#include "cmd/break.c"`	72	`#include "cmd/break.c"`
73	`#include "cmd/call.c"`	73	`#include "cmd/call.c"`
74	`#include "cmd/cd.c"`	74	`#include "cmd/cd.c"`
75	`#include "cmd/chcp.c"`	75	`#include "cmd/chcp.c"`
76	`#include "cmd/cls.c"`	76	`#include "cmd/cls.c"`
77	`#include "cmd/copy.c"`	77	`#include "cmd/copy.c"`
78	`#include "cmd/date.c"`	78	`#include "cmd/date.c"`
79	`#include "cmd/del.c"`	79	`#include "cmd/del.c"`
-		80	`#include "cmd/for.c"`
80	`#include "cmd/goto.c"`	81	`#include "cmd/goto.c"`
81	`#include "cmd/if.c"`	82	`#include "cmd/if.c"`
82	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`	83	`#include "cmd/vol.c" /* must be included before dir.c due to dependency */`
83	`#include "cmd/dir.c"`	84	`#include "cmd/dir.c"`
84	`#include "cmd/echo.c"`	85	`#include "cmd/echo.c"`
85	`#include "cmd/exit.c"`	86	`#include "cmd/exit.c"`
86	`#include "cmd/ln.c"`	87	`#include "cmd/ln.c"`
87	`#include "cmd/mkdir.c"`	88	`#include "cmd/mkdir.c"`
88	`#include "cmd/path.c"`	89	`#include "cmd/path.c"`
89	`#include "cmd/pause.c"`	90	`#include "cmd/pause.c"`
90	`#include "cmd/prompt.c"`	91	`#include "cmd/prompt.c"`
91	`#include "cmd/rem.c"`	92	`#include "cmd/rem.c"`
92	`#include "cmd/rename.c"`	93	`#include "cmd/rename.c"`
93	`#include "cmd/rmdir.c"`	94	`#include "cmd/rmdir.c"`
94	`#include "cmd/set.c"`	95	`#include "cmd/set.c"`
95	`#include "cmd/shift.c"`	96	`#include "cmd/shift.c"`
96	`#include "cmd/time.c"`	97	`#include "cmd/time.c"`
97	`#include "cmd/type.c"`	98	`#include "cmd/type.c"`
98	`#include "cmd/ver.c"`	99	`#include "cmd/ver.c"`
99	`#include "cmd/verify.c"`	100	`#include "cmd/verify.c"`
100		101
101		102
102	`struct CMD_ID {`	103	`struct CMD_ID {`
103	`const char *cmd;`	104	`const char *cmd;`
104	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`	105	`enum cmd_result (func_ptr)(struct cmd_funcparam ); /* pointer to handling function */`
105	`};`	106	`};`
106		107
107	`const struct CMD_ID INTERNAL_CMDS[] = {`	108	`const struct CMD_ID INTERNAL_CMDS[] = {`
108	`{"BREAK", cmd_break},`	109	`{"BREAK", cmd_break},`
109	`{"CALL", cmd_call},`	110	`{"CALL", cmd_call},`
110	`{"CD", cmd_cd},`	111	`{"CD", cmd_cd},`
111	`{"CHCP", cmd_chcp},`	112	`{"CHCP", cmd_chcp},`
112	`{"CHDIR", cmd_cd},`	113	`{"CHDIR", cmd_cd},`
113	`{"CLS", cmd_cls},`	114	`{"CLS", cmd_cls},`
114	`{"COPY", cmd_copy},`	115	`{"COPY", cmd_copy},`
115	`{"CTTY", cmd_notimpl},`	116	`{"CTTY", cmd_notimpl},`
116	`{"DATE", cmd_date},`	117	`{"DATE", cmd_date},`
117	`{"DEL", cmd_del},`	118	`{"DEL", cmd_del},`
118	`{"DIR", cmd_dir},`	119	`{"DIR", cmd_dir},`
119	`{"ECHO", cmd_echo},`	120	`{"ECHO", cmd_echo},`
120	`{"ERASE", cmd_del},`	121	`{"ERASE", cmd_del},`
121	`{"EXIT", cmd_exit},`	122	`{"EXIT", cmd_exit},`
-		123	`{"FOR", cmd_for},`
122	`{"GOTO", cmd_goto},`	124	`{"GOTO", cmd_goto},`
123	`{"IF", cmd_if},`	125	`{"IF", cmd_if},`
124	`{"LH", cmd_notimpl},`	126	`{"LH", cmd_notimpl},`
125	`{"LN", cmd_ln},`	127	`{"LN", cmd_ln},`
126	`{"LOADHIGH",cmd_notimpl},`	128	`{"LOADHIGH",cmd_notimpl},`
127	`{"MD", cmd_mkdir},`	129	`{"MD", cmd_mkdir},`
128	`{"MKDIR", cmd_mkdir},`	130	`{"MKDIR", cmd_mkdir},`
129	`{"PAUSE", cmd_pause},`	131	`{"PAUSE", cmd_pause},`
130	`{"PATH", cmd_path},`	132	`{"PATH", cmd_path},`
131	`{"PROMPT", cmd_prompt},`	133	`{"PROMPT", cmd_prompt},`
132	`{"RD", cmd_rmdir},`	134	`{"RD", cmd_rmdir},`
133	`{"REM", cmd_rem},`	135	`{"REM", cmd_rem},`
134	`{"REN", cmd_rename},`	136	`{"REN", cmd_rename},`
135	`{"RENAME", cmd_rename},`	137	`{"RENAME", cmd_rename},`
136	`{"RMDIR", cmd_rmdir},`	138	`{"RMDIR", cmd_rmdir},`
137	`{"SET", cmd_set},`	139	`{"SET", cmd_set},`
138	`{"SHIFT", cmd_shift},`	140	`{"SHIFT", cmd_shift},`
139	`{"TIME", cmd_time},`	141	`{"TIME", cmd_time},`
140	`{"TYPE", cmd_type},`	142	`{"TYPE", cmd_type},`
141	`{"VER", cmd_ver},`	143	`{"VER", cmd_ver},`
142	`{"VERIFY", cmd_verify},`	144	`{"VERIFY", cmd_verify},`
143	`{"VOL", cmd_vol},`	145	`{"VOL", cmd_vol},`
144	`{NULL, NULL}`	146	`{NULL, NULL}`
145	`};`	147	`};`
146		148
147		149
148	`/* NULL if cmdline is not matching an internal command, otherwise returns a`	150	`/* NULL if cmdline is not matching an internal command, otherwise returns a`
149	`* pointer to a CMD_ID struct */`	151	`* pointer to a CMD_ID struct */`
150	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`	152	`static const struct CMD_ID cmd_match(const char cmdline, unsigned short *argoffset) {`
151	`unsigned short i;`	153	`unsigned short i;`
152	`char buff[10];`	154	`char buff[10];`
153		155
154	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`	156	`/* copy command to buffer, until space, NULL, tab, return, dot, slash or backslash */`
155	`for (i = 0; i < 9; i++) {`	157	`for (i = 0; i < 9; i++) {`
156	`if (cmdline[i] == ' ') break;`	158	`if (cmdline[i] == ' ') break;`
157	`if (cmdline[i] == 0) break;`	159	`if (cmdline[i] == 0) break;`
158	`if (cmdline[i] == '\t') break;`	160	`if (cmdline[i] == '\t') break;`
159	`if (cmdline[i] == '\r') break;`	161	`if (cmdline[i] == '\r') break;`
160	`if (cmdline[i] == '.') break;`	162	`if (cmdline[i] == '.') break;`
161	`if (cmdline[i] == '/') break;`	163	`if (cmdline[i] == '/') break;`
162	`if (cmdline[i] == '\\') break;`	164	`if (cmdline[i] == '\\') break;`
163	`buff[i] = cmdline[i];`	165	`buff[i] = cmdline[i];`
164	`}`	166	`}`
165	`buff[i] = 0;`	167	`buff[i] = 0;`
166		168
167	`/* advance to nearest non-space to find where arguments start */`	169	`/* advance to nearest non-space to find where arguments start */`
168	`while (cmdline[i] == ' ') i++;`	170	`while (cmdline[i] == ' ') i++;`
169	`*argoffset = i;`	171	`*argoffset = i;`
170		172
171	`/* try matching an internal command */`	173	`/* try matching an internal command */`
172	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`	174	`for (i = 0; INTERNAL_CMDS[i].cmd != NULL; i++) {`
173	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`	175	`/printf("imatch(%s,%s)\r\n", buff, INTERNAL_CMDS[i].cmd); /`
174	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`	176	`if (imatch(buff, INTERNAL_CMDS[i].cmd)) {`
175	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`	177	`/printf("match cmd i=%u (buff=%s)\r\n", i, buff);/`
176	`return(&(INTERNAL_CMDS[i]));`	178	`return(&(INTERNAL_CMDS[i]));`
177	`}`	179	`}`
178	`}`	180	`}`
179		181
180	`return(NULL); /* command is not recognized as internal */`	182	`return(NULL); /* command is not recognized as internal */`
181	`}`	183	`}`
182		184
183		185
184	`/* explodes a command into an array of arguments where last arg is NULL.`	186	`/* explodes a command into an array of arguments where last arg is NULL.`
185	`* if argvlist is not NULL, it will be filled with pointers that point to buff`	187	`* if argvlist is not NULL, it will be filled with pointers that point to buff`
186	`* locations. buff is filled with all the arguments, each argument being`	188	`* locations. buff is filled with all the arguments, each argument being`
187	`* zero-separated. buff is terminated with an empty argument to mark the end`	189	`* zero-separated. buff is terminated with an empty argument to mark the end`
188	`* of arguments.`	190	`* of arguments.`
189	`* returns number of args */`	191	`* returns number of args */`
190	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`	192	`unsigned short cmd_explode(char buff, const char far s, char const **argvlist) {`
191	`int si = 0, argc = 0, i = 0;`	193	`int si = 0, argc = 0, i = 0;`
192	`for (;;) {`	194	`for (;;) {`
193	`/* skip to next non-space character */`	195	`/* skip to next non-space character */`
194	`while (s[si] == ' ') si++;`	196	`while (s[si] == ' ') si++;`
195	`/* end of string? */`	197	`/* end of string? */`
196	`if (s[si] == 0) break;`	198	`if (s[si] == 0) break;`
197	`/* set argv ptr */`	199	`/* set argv ptr */`
198	`if (argvlist) argvlist[argc] = buff + i;`	200	`if (argvlist) argvlist[argc] = buff + i;`
199	`argc++;`	201	`argc++;`
200	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`	202	`/* find next arg delimiter (spc, null, slash or plus) while copying arg to local buffer */`
201	`do {`	203	`do {`
202	`buff[i++] = s[si++];`	204	`buff[i++] = s[si++];`
203	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`	205	`} while (s[si] != ' ' && s[si] != 0 && s[si] != '/' && s[si] != '+');`
204	`buff[i++] = 0;`	206	`buff[i++] = 0;`
205	`/* is this end of string? */`	207	`/* is this end of string? */`
206	`if (s[si] == 0) break;`	208	`if (s[si] == 0) break;`
207	`}`	209	`}`
208	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`	210	`buff[i] = 0; /* terminate with one extra zero to tell "this is the end of list" */`
209	`if (argvlist) argvlist[argc] = NULL;`	211	`if (argvlist) argvlist[argc] = NULL;`
210	`return(argc);`	212	`return(argc);`
211	`}`	213	`}`
212		214
213		215
214	`enum cmd_result cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void BUFFER, unsigned short BUFFERSZ, const struct redir_data redir, unsigned char delstdin) {`	216	`enum cmd_result cmd_process(struct rmod_props far rmod, unsigned short env_seg, const char cmdline, void BUFFER, unsigned short BUFFERSZ, const struct redir_data redir, unsigned char delstdin) {`
215	`const struct CMD_ID *cmdptr;`	217	`const struct CMD_ID *cmdptr;`
216	`unsigned short argoffset;`	218	`unsigned short argoffset;`
217	`enum cmd_result cmdres;`	219	`enum cmd_result cmdres;`
218	`struct cmd_funcparam p = (void )BUFFER;`	220	`struct cmd_funcparam p = (void )BUFFER;`
219	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`	221	`p->BUFFERSZ = BUFFERSZ - sizeof(*p);`
220		222
221	`/* special case: is this a drive change? (like "E:") */`	223	`/* special case: is this a drive change? (like "E:") */`
222	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`	224	`if ((cmdline[0] != 0) && (cmdline[1] == ':') && ((cmdline[2] == ' ') \|\| (cmdline[2] == 0))) {`
223	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`	225	`if (((cmdline[0] >= 'a') && (cmdline[0] <= 'z')) \|\| ((cmdline[0] >= 'A') && (cmdline[0] <= 'Z'))) {`
224	`unsigned char drive = cmdline[0];`	226	`unsigned char drive = cmdline[0];`
225	`unsigned char curdrive = 0;`	227	`unsigned char curdrive = 0;`
226	`if (drive >= 'a') {`	228	`if (drive >= 'a') {`
227	`drive -= 'a';`	229	`drive -= 'a';`
228	`} else {`	230	`} else {`
229	`drive -= 'A';`	231	`drive -= 'A';`
230	`}`	232	`}`
231	`_asm {`	233	`_asm {`
232	`push ax`	234	`push ax`
233	`push dx`	235	`push dx`
234	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`	236	`mov ah, 0x0e /* DOS 1+ - SELECT DEFAULT DRIVE */`
235	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`	237	`mov dl, drive /* DL = new default drive (00h = A:, 01h = B:, etc) */`
236	`int 0x21`	238	`int 0x21`
237	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`	239	`mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */`
238	`int 0x21`	240	`int 0x21`
239	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`	241	`mov curdrive, al /* cur drive (0=A, 1=B, etc) */`
240	`pop dx`	242	`pop dx`
241	`pop ax`	243	`pop ax`
242	`}`	244	`}`
243	`if (curdrive == drive) return(CMD_OK);`	245	`if (curdrive == drive) return(CMD_OK);`
244	`nls_outputnl_doserr(0x0f);`	246	`nls_outputnl_doserr(0x0f);`
245	`return(CMD_FAIL);`	247	`return(CMD_FAIL);`
246	`}`	248	`}`
247	`}`	249	`}`
248		250
249	`/* try matching an internal command */`	251	`/* try matching an internal command */`
250	`cmdptr = cmd_match(cmdline, &argoffset);`	252	`cmdptr = cmd_match(cmdline, &argoffset);`
251	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`	253	`if (cmdptr == NULL) return(CMD_NOTFOUND); /* command is not recognized as internal */`
252		254
253	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`	255	`/* printf("recognized internal command: '%s', tail of command at offset %u\r\n", cmdptr->cmd, argoffset); */`
254		256
255	`/* apply redirections (if any) */`	257	`/* apply redirections (if any) */`
256	`if (redir_apply(redir) != 0) return(CMD_FAIL);`	258	`if (redir_apply(redir) != 0) return(CMD_FAIL);`
257		259
258	`/* prepare function parameters and feed it to the cmd handling function */`	260	`/* prepare function parameters and feed it to the cmd handling function */`
259	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`	261	`p->argc = cmd_explode(p->argvbuf, cmdline + argoffset, p->argv);`
260	`p->env_seg = env_seg;`	262	`p->env_seg = env_seg;`
261	`p->rmod = rmod;`	263	`p->rmod = rmod;`
262	`p->argoffset = argoffset;`	264	`p->argoffset = argoffset;`
263	`p->cmdline = cmdline;`	265	`p->cmdline = cmdline;`
264		266
265	`cmdres = (cmdptr->func_ptr)(p);`	267	`cmdres = (cmdptr->func_ptr)(p);`
266		268
267	`/* cancel redirections */`	269	`/* cancel redirections */`
268	`redir_revert();`	270	`redir_revert();`
269		271
270	`/* delete stdin temporary file */`	272	`/* delete stdin temporary file */`
271	`if (delstdin) {`	273	`if (delstdin) {`
272	`const char *fname = redir->stdinfile;`	274	`const char *fname = redir->stdinfile;`
273	`unsigned short doserr = 0;`	275	`unsigned short doserr = 0;`
274	`_asm {`	276	`_asm {`
275	`push ax`	277	`push ax`
276	`push dx`	278	`push dx`
277	`mov ah, 0x41 /* delete a file */`	279	`mov ah, 0x41 /* delete a file */`
278	`mov dx, fname /* DS:DX - filename to delete */`	280	`mov dx, fname /* DS:DX - filename to delete */`
279	`int 0x21`	281	`int 0x21`
280	`jnc DONE`	282	`jnc DONE`
281	`mov doserr, ax`	283	`mov doserr, ax`
282	`DONE:`	284	`DONE:`
283	`pop dx`	285	`pop dx`
284	`pop ax`	286	`pop ax`
285	`}`	287	`}`
286	`if (doserr) {`	288	`if (doserr) {`
287	`output(fname);`	289	`output(fname);`
288	`output(": ");`	290	`output(": ");`
289	`nls_outputnl_doserr(doserr);`	291	`nls_outputnl_doserr(doserr);`
290	`}`	292	`}`
291	`}`	293	`}`
292		294
293	`return(cmdres);`	295	`return(cmdres);`
294	`}`	296	`}`
295		297

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd.c – Rev 962 → 982